Error message for insufficient Datacenter role was misleading. VDDK 5.1.x and VDDK 5.5 require the backup administrator to have permissions for the vCenter role, instead of just the Datacenter role. If the user has restricted permissions of a lesser role, the misleading message not licensed to use this function would appear. This has been the case since VDDK 5.1. It is fixed in this update by logging the message "Licenses could not be retrieved for supplied user credentials".

Resolution:

Create the vCenter account used by Avamar at the vCenter level not the Datacenter one.